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We have a 48" Pioneer Plasma Tv Model PDP 435PU. When you turn it on it tries to turn on, but switches to "standby" and the standby button just blinks at you

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  • umlaut Nov 16, 2008

    How do we get the tv out of "protect mode"

  • umlaut Nov 16, 2008

    How is this problem fixed?

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The most common failure that causes your symptoms is a failure of the SUS boards, or sustain boards which drive the panel. There are two sets of sustain boards, X and Y (or Y and Z for some manufacturers), one set each to drive the horizontal and vertical signals for the panel. The bad news? It isn't something a consumer can diagnose or replace, for the most part. There are DANGEROUS voltages inside your set that can easily kill or cause serious injury. After replacing sustain boards there are certain adjustments required that ned to be performed by a qualified tech. So, you'll need a tecnician to look at it for you. Sorry!

Posted on Nov 16, 2008

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That means that there is an internal error and the tv is in protect mode.

Posted on Nov 16, 2008

  • Ginko
    Ginko Nov 16, 2008

    When this happens it means that there is an internal error and the tv is in protect mode.

    The TV protection circuit detects that there is an internal problem, as a wrong voltage, a short, a capacitor that has blown or a different defectivecomponent.

    After detecting the fault the TV set itself to Protect mode activating a safety switch that will prevent the TV from starting up to avoid further damage.
    The safety switch that keeps turning TV off is also the clicking noise that you often hear when the TV is in this state.

    If the protection circuit was wrong and there is no real problem you can fix this by leaving the TV set unplugged for a couple of hours, so to drain power completely and reset TV eeproms and protection circuit. This for example happens often after a power surge.

    If that does not work, then it means that there is a real fault, in this case you will need to call a technician to test the internal parts.
    If you need to call service you can use the phone number listed on the owner manual.


  • Ginko
    Ginko Nov 16, 2008

    Even if problems with Sustain boards are common on Plasma sets, it is not necessarily a sustain board problem.

    Unless you want to take apart the tv by yourself (at your risk) to test Ysus and Zsus, it is still better calling a technician.
    If you want to DIY we can provide guidance.

    I also report here my previous comment for better clarity:

    When this happens it means that there is an internal error and the tv is in protect mode.

    The
    TV protection circuit detects that there is an internal problem, as a
    wrong voltage, a short, a capacitor that has blown or a different
    defectivecomponent.

    After detecting the fault the TV set itself
    to Protect mode activating a safety switch that will prevent the TV
    from starting up to avoid further damage.
    The safety switch that keeps turning TV off is also the clicking noise that you often hear when the TV is in this state.

    If
    the protection circuit was wrong and there is no real problem you can
    fix this by leaving the TV set unplugged for a couple of hours, so to
    drain power completely and reset TV eeproms and protection circuit.
    This for example happens often after a power surge.

    If that does
    not work, then it means that there is a real fault, in this case you
    will need to call a technician to test the internal parts.
    If you need to call service you can use the phone number listed on the owner manual.




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Good day!!!

normally,,that problem is caused of failing capacitors on the boards..

This is example picture of capacitor:
bugoy31_11.jpg

Follow this procedure on how to fix your TV..

  1. open the back cover
  2. look at the chassis/board inside your TV.
  3. try to look all capacitors inside..it likes the picture above..
  4. look at the actual image if it has a leak on oil/bulged on the top..
  5. try to replaced it with the same type,ratings and value.using soldering iron and soldering lead.
  6. after you replaced the bad capacitors..try to power it ON again to test if it is OK.
please watch this video for guide on how to replaced bad capacitors on the board.

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